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12 bolt vs. 14bsf

Discussion in 'The Garage' started by Ben B., Aug 23, 2006.

  1. Ben B.

    Ben B. 1/2 ton status

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    My badass new '78 K10 has a 12 bolt rear, would it be worth upgrading to a 14bsf in the future or is the strength near the same? My 35's will be on the K10 soon...I'm pretty sure the 12 bolt will hold up though.

    Opinions.
     
  2. 1977k5

    1977k5 3/4 ton status Vendor

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    The 14sf is a fair amount stronger than your 12 bolt. If I were you, I would run the 12 bolt 'til you break it then replace it with a 14sf.
     
  3. dyeager535

    dyeager535 1 ton status Premium Member

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    If you want to continue running your 6 lug wheels, start looking for the SF now, as 6 lug 14SF's (especially the gearing you want, whatever it is) aren't real easy to find. They are out there, but you may spend some time looking before you find the right one.

    They aren't infinitely stronger than a 12 bolt, but for parts failure, you hear very little about the 14SF.
     
  4. Ben B.

    Ben B. 1/2 ton status

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    That's always the plan. lol
     
  5. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    A good set of axleshafts and a 1350 yoke are a great way to semi-bulletproff the 12 bolt with 35 inch tires . A disc brake setup will hold the axles in if you break one .

    Myself , I just wheel mine and carry shafts . Its cheaper for me . I will probably end up breaking something I don't carry :thumb:
     
  6. GEORGIA GABE

    GEORGIA GABE 1/2 ton status

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    I wheel a 12 bolt and carry shafts. 35s are the max so I hear but so far the only thing I broke was a 2 week old ring and pinion. Richmond warrantied it due to the hardening not being proper.
    gabe
     
  7. 1BadK-30

    1BadK-30 1/2 ton status

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    bit off topic sry if im high jacking but does a 14bsf come in a 5 lug?
     
  8. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    I wheel a 12bolt. I broke it last year at Blazer Bash, stripped teeth off the ring gear. The ring and pinion were 37 years old, and the guys that fixed it thought that the gears were setup wrong when the Detroit was installed. I was still able to limp the truck back to Moab, about 15 miles.

    I'm still running the 12bolt with new 4.56 gears. No more breakage. I say run the 12bolt until it breaks.
     
  9. neverendingproject

    neverendingproject 1/2 ton status

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    They came 5 lug in 454ss trucks, but you can get aftermarket shafts for fairly cheap. Ive also seen some 2wd work truck that had a 14sf and 5 lug.
     
  10. marv_springer

    marv_springer 1/2 ton status

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    Wow...!

    No 14bFF advice.... :dunno:

    Ok... I'll do it...... GET A FULL FLOATER...!
    :D

    Marv
     
  11. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    x2

    Usually run-it-till-it-breaks is good advice to avoid spending too much $$$ during the build process.... but ff14b axles are so damn cheap that it doesn't really make sense to skimp. You see them for $100-200 all the time... and if you can't afford that, you can't afford to go wheeling anyway. ;)

    j
     
  12. pauly383

    pauly383 Daddy383 Staff Member Moderator

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    Whats funny is I have spent 2 or 3 times a 14bff buying up all the shafts I can for 10b fronts and 12 bolt rears . I haven't broken one yet ( knocks on wood ) I just want to corner the market . Someday all the 14bff will be under every last K5-K30 , every jeep and Bronco , and all that will be left is 12 bolts and 10 bolts ..... and I will be the only one with the shafts :pimp:
     
  13. marv_springer

    marv_springer 1/2 ton status

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    Well.... just to set the record straight..... I was joking.

    I'm still running that 1/2 ton crap myself!:haha: Someday I'll get in the big leages!

    Marv
     
  14. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    Let's not forget approx $200 for the 8-lug wheels, presumably 15"ers to fit the tires he has now. Around here it's another $100 for 8-lug outers from the u-pull-it. You'll have to cough up more money for spring perches if it's a 1-ton 14bff. And that damn conversion joint is almost $40.
     
  15. bajaviking

    bajaviking 1/2 ton status

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    There is a big difference between a 12 bolt and a 14 bolt SF, if you put the carriers side by side you will see what I mean. I didn't feel like buying new wheels or converting my front to 8 lugs so I run a 14 B SF with 6 lugs, I don't plan on running tires bigger than 37's so I think it should be OK.
     
  16. bajaviking

    bajaviking 1/2 ton status

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    You forgot about the always entertaining e-brake issue, I don't know about you guys but I like having an e-brake when I have to park my truck on a hill in the middle of the trail.
     
  17. mrk5

    mrk5 The Sticker Guy Moderator Vendor GMOTM Winner Author

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    True that!
     
  18. neverendingproject

    neverendingproject 1/2 ton status

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    The difference between 14sf and 10b. Im sure the 12b one isnt too much bigger.
     
  19. jekbrown

    jekbrown I am CK5 Premium Member GMOTM Winner Author

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    doesn't anyone make a 8-to-6 lug spacer/conversion? save the $ from having to buy new wheels etc. I dunno, for me, not breaking my rear end is worth more than $100. I rarely get to go wheeling and if I **** up a trip with something as silly as a rear axle shaft I'd be highly annoyed. lol!

    j
     
  20. neverendingproject

    neverendingproject 1/2 ton status

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    I meant to post this in my last post. Ooops

    [​IMG]
     

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